单项选择题
A.0.15~0.25 B.0.30~0.40 C.0.45~0.65 D.0.70~0.80
A.0.20~0.30 B.0.35~0.55 C.0.60~0.70 D.0.75~0.85
A.0.20~0.40 B.0.45~0.60 C.0.65~0.70 D.0.75~0.85